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D. H. CHAMBERLAIN.

HAND STAMP.

No. 66,560. Patented July 9, 1867.

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DEXTER H. CHAMBERLAIN, OF WEST ROXBURY, MASSACHUSETTS.

Letters Patent No, 66,560, datecZJztZy 9, 1867.

IMPROVEMENT In HAND-STAMPS.

Be it known that I, DEXTER H. CHAMBERLAIN, of West Roxbury, in the county of Norfolk, and State of Massachusetts, have invented a new and useful Improvement in Hand Stamps, of which the following is a full, clear, and exact description, reference being bad to the accompanying drawings, making a part of this specification, in which- V Figure 1 represents a hand-stamp, containing my improvements, in elevation.

Figure 2 is a transverse section of the same, on the line y y of fig. 1.

Figure 3 is a view of the type-wheels, of different diameters, and showing a common and an eccentric axis.

Similar letters indicate like parts in the several figures.

My invention is designed as an improvement upon a hand-stamp for which a patentwas granted to me on January 22, 1867. In that device the typewheels, for indicating months, days, and years'respeetively, are arranged upon separate and independent axes, which made it necessary that a wheel on one side of the centrewheel should be sufiiciently small in diameter to bring the upper part of its perimeter below the axis ofthe said centre-wheel, thus limiting the circumference to a small number of dates on the side-wheel. In the said patented device also, the inking ribbon was folded over a fixed stud, so that a difliculty was liable to occur in changing the position of the said ribbon on the die, from its biting on the edges of the die-plate.

It is the object of my present invention to obviate the difliculties above mentioned, which I have accom plished, in the first place, by placing the type-wheels upon a common axis, and upon this axis securing an eccentric disk, which serves as an axis or centre of a wheel of larger diameter, the size of the said eccentric disk being proportioned to the diameter of its wheel.

i In the second place, the stud, over which the inking ribbon is folded, is attached to a swinging arm, whi h is so arranged as to admit of the folded end of the ribbon to be lowered, and thus slaeken the said ribbon sufiiciently to relieve it from the bite on the dic-plate, and allow it to be easily wound from one spindle to the other.

Referring to the drawings, A represents the base of the stamp, having an upright, A, at its rear end, which supports the arm C, the latter being held in an elevated position by means of a coiled spring. Two spindles are arranged within the central portion D of the arm 0 upon which the inking ribbon is wound. I3 is the cushion upon which the die is struck when an impression is made. All of the above parts are constructed as described in the patent above referred to. The type-wheels a b c are arranged in a recess within the head C. 01 represents an axis or shaft, which is fixed within the head G, extending transversely across the same. Upon this shaft cl the type-wheels a and c rotate freely. Upon the shaft CZ is firmly secured an eccentric disk, 0;, as seen in fig. 3, which serves as an axis for the wheel 6, and upon which the said wheel freely rotates us upon a central shaft. Thus it will be seen that type-wheels of different diameters may be arranged to otate around a common axis, so as to accommodate on their several peripheries any suitable or desired number of dates to represent the days, months, or years. More than one eccentric disk may be placed upon the main axis d, if it is found desirable to increase the diameter of one of the side-wheels. The marking portion of each type-wheel will thus be brought within a narrow compass in the same plane, so as to admit of a small opening in the dieplate, through which the vtype-wheels pass, being'used. K represents the inking ribbon, which passes from the spindles in the part D under the die-plate and over a pin or stud, S. The stud S is attached to the outer end of an arm, m, which is pivoted, as shown at p, to the lower end of the head C. The arm at is held in position, to maintain the inking ribbon in working order, by means of a spring stud, r, by releasing which the arm m may be turned on its pivot, as indicatedin red lines in fig. 1, and the ribbon will be slackened so that it can be readily wound from one spindle to the other to change its position on the die-plate. The typo-wheels a b c are held in position by means of spring-pins 22, passing through the sides of the head C and entering holes in th sides of the said wheels. Each wheel can thus be quickly and readily adjusted in position.

What I claim as new, and desire to secure by Letters Patent, is 1 1. Mounting the type-wheels of a hand-stamp on a common axis or shaft, to which latter is secured an eccentric disk, serving as a centre or axis for one of the wheels, whereby wheels of different diameters may be used, so that the lower part of their perimeters may be brought to bear in a common plane and in a small compass within the die-plate. a v

2. I claim the pivoted arm m, in combination with the stud S and inking ribbon K, for the purpose of enabling the inking ribbon to be slackened when its position is to be changed upon the die-plate.

In testimony whereof Ihave signed my name to this specification in the presence of two subscribing witnesses.

DEXTER. II. CHAMBERLAIN.

Witnesses:

J H: ADAMS, M. S. G. WILDE. 

